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From: Akshay Saraswat <akshay.s@samsung.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] Exynos5: clock: Update the equation to calculate PLL output frequency
Date: Fri, 22 Mar 2013 08:26:36 -0400	[thread overview]
Message-ID: <1363955196-1217-1-git-send-email-akshay.s@samsung.com> (raw)

According to the latest exynos5 user manual, the equation for
calculating PLL output was changed to
FOUT= MDIV x FIN/(PDIV x 2^SDIV)
earlier it was
FOUT= MDIV x FIN/(PDIV x 2^(SDIV -1))
So updating the clock code accordingly.

Signed-off-by: Hatim Ali <hatim.rv@samsung.com>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
---
 arch/arm/cpu/armv7/exynos/clock.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index 956427c..5299bc7 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -73,10 +73,8 @@ static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k)
 		/* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */
 		fout = (m + k / 1024) * (freq / (p * (1 << s)));
 	} else {
-		if (s < 1)
-			s = 1;
-		/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */
-		fout = m * (freq / (p * (1 << (s - 1))));
+		/* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */
+		fout = m * (freq / (p * (1 << s)));
 	}
 
 	return fout;
-- 
1.8.0

             reply	other threads:[~2013-03-22 12:26 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-22 12:26 Akshay Saraswat [this message]
2013-03-23  0:41 ` [U-Boot] [PATCH] Exynos5: clock: Update the equation to calculate PLL output frequency Simon Glass
2013-05-21 11:19 ` Minkyu Kang
2013-03-27  8:58 Akshay Saraswat

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